index 579 



PAGE 



Trilobite, appendages summarized 177 



compared with Anaspidacea 173 



Apus 163 



Limulus polyphemus 163 



comparison suggested with Mysidacea, Euphausiacea, " Schizopods " 173 



descendent from Branchiopoda 117 



descent 169, 170 



dorsal shield 176 



compared with Apus and Limulus 167 



eggs 178 



extinction 178 



food 178 



intermediate between Branchiopoda and lower Malacostraca 162 



intestinal canal 177 



manner of life 123, 178 



not allied with Arachnids 169 



persistence in time 178 



probable descent 168 



respiration 164, 178 



restoration of thoracic limbs 166 



ventral appendages 165 



integument 155, 387 



spawning habit 178 



structure 154 



appendages, limb 158 



position of the limbs 162 



tracks and trails, discussed 174, 175 



figured, pis. 37-4 2 209 



Trilobites, affinities of the 376 



Trinucleus concentricus Eaton, described 153, 156 



figured, pi. 104, figs. 6-H 454 



goldfussi, intestinal canal 157 



Murch 153 



exopodite and thoracic limbs 160 



Tuponia Walcott, described 271 



bellilineata Walcott, described 274 



figured, pi. 64, figs. 2, 2a, b 338 



Aexilis var. intermedia Walcott, described 276 



figured, pi. 64, figs. I, la, b 338 



Aexilis Walcott, described 275 



figured, pi. 65, figs. 1, la-d 339 



lineata Walcott, described 272 



figured, pi. 62, figs. 1, la, b; pi. 63, figs. 1, la-c 336, 337 



Ulrich, Dr. E. 133, 366, 368, 369, 371, 380, 381, 467, 468, 470, 475 



Valiant, discovery of antennules of Triarthrus 1 17, 137 



Vanuxemcllu nortia Walcott 37 



figured, pi. 7, fig. 7 58 



